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Modelling the Stress-Settlement Behavior of Shallow Foundation in Unsaturated Sand Using Sigma/W and Plaxis

Zhong Han, Singyu Han, Won Teak Oh, Sai K. Vanapalli

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Unsaturated Soils

ABSTRACT: The stress versus settlement behavior of shallow foundations is significantly influenced by soil suction since it contributes to the changes in strength and stiffness of the subgrade soil. Oh and Vanapalli (2011) proposed a framework for modelling the stress versus settlement behavior of shallow foundations loaded in unsaturated soils taking account of the influence of soil suction using commercial finite element software, Sigma/W. In this paper, this framework is extended to model the stress versus settlement behavior of the same model footing tests using commercial finite element software, Plaxis. Comparisons are provided between the stress versus settlement behaviors obtained from model footing tests and from both the software. Discussions are also presented regarding the strengths and limitations of modeling the stress versus settlement behaviors of shallow foundations in unsaturated soils using finite element software, Sigma/W and Plaxis.

RÉSUMÉ: Le comportement de tassement en fonction de la contrainte appliquée pour des fondations superficielles est influencée de manière marquée par la succion puisqu'elle contribue aux changements de résistance et de rigidité du sol sous-jacent. Oh et Vanapalli (2011) on proposé un cadre conceptuel de modélisation du comportement de contrainte et déformation de fondations superficielles sur des sols non-saturés tenant compte de l'influence de la succion matricielle en utilisant le logiciel d'analyse par éléments finis Sigma/W. Dans le présent article, ce cadre conceptuel est appliqué en utilisant le logiciel Plaxis. Des comparaisons sont données entre les relations de contrainte et déformation obtenues à partir des deux logiciels. Une discussion est également présentée sur les forces et faiblesses de la modélisation du comportement de contrainte et déformation en utilisant les logiciels d'analyse par éléments finis Sigma/W et Plaxis..

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Cite this article:
Zhong Han; Singyu Han; Won Teak Oh; Sai K. Vanapalli (2014) Modelling the Stress-Settlement Behavior of Shallow Foundation in Unsaturated Sand Using Sigma/W and Plaxis in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoRegina14Paper346, author = Zhong Han; Singyu Han; Won Teak Oh; Sai K. Vanapalli,
title = Modelling the Stress-Settlement Behavior of Shallow Foundation in Unsaturated Sand Using Sigma/W and Plaxis,
year = 2014
}